Drinking cup



FIG. 1 is a top perspective view of a drinking cup;

FIG. 2 is a front side view thereof, the back side view being a mirror image to the front side view;

FIG. 3 is a right side view of thereof, the left side being a mirror image to the right side;

FIG. 4 is a top view thereof; and,

FIG. 5 is a bottom view thereof.

The broken lines in the drawings illustrate features that form no part of the claimed design. 

CLAIM The ornamental design for a drinking cup, as shown and described. 